Amanda Knox told social media she is innocent of killing student Meredith Kercher in Italy(@amamaknox)

Amanda Knox is to marry in a quiet wedding with her conviction for murdering student Meredith Kercher casting a shadow over the nuptials.

Knox, 27, has got engaged to a rock musician named Colin Sutherland, also 27, reported the Seattle Times.

Knox stands convicted of murdering Kercher in an alleged sex game at a house in Perugia, Italy, in 2007. But a Supreme Court appeal next month may overturn the judgment and clear Knox's name - or cement her guilt.

Breaking news of her engagement, The Times reported: "Her engagement was disclosed by a source close to the family, and Knox confirmed it in an email, but declined to say anything else." No date for the wedding has been set, noted the article.

Knox has been convicted twice and acquitted once of killing Kercher. She is currently subject of a 28-year prison sentence in Italy, but this may be quashed.

Co-defendant Raffaele Sollecito also received a lengthy jail term and is due to learn his fate at next month's appeal verdict. He has spoken previously of "anomalies" in Knox's version of events on the night Kercher died.

Knox has repeatedly denied she killed the student from south London, including publicly protesting her innocence on Twitter, as in the photo above. She is presently a theatre critic for Seattle paper.